Fourths to francis e



(No Model.)

S. L. FOSTER.

STOP MOTION.

No. 423,917. Patented Mar. 25, 1890.

vvmmtoz Samuel 12 faster 4 UNITED STATES PAT NT Trice.

FOURTHS TO FRANCIS E. GALLAGHER, JOHN P. HASLAM,

AHRENS, ALL OF SAME PLACE.

AND JOHN T.

STOP-MOTION.

SPECIFICATION forming part of Letters Patent No. 423,917, dated March25, 1890.

Application filed July 3, 1889. Serial No.316,418. (N model.) I

To aZZ whom it may concern:

Be it known that I, SAMUEL L. FOSTER, of WVilmington, in the county ofNewcastle and State of Delaware, have invented certain new and usefulImprovements in Stop-Motions for Machinery, of which the following is aspecification.

In different and numerous kinds of ma chinery it is desirable ornecessary that the operation of the machinery should be autoable to stopthe pump when the boiler or tank is full, and the various classes oftextile machines, wherein it is essential that the machine should bestopped on the occurrence of any defect in the thread. In the majorityof such cases, especially in the case of textile machines, the emergencyor defect is of such a character that it does not offer a source ofpower bearing any adequate proportion to the power required to effectthe actual stoppage of the machine, which is usually effected by themovement of a lever, which either shifts a driving-belt from a fast to aloose pulley on the main drive-shaft of the machine or closes a valve orcook in a steam-pipe supplying steam to an engine operating the machine. It is hence essential, in order to stop the machine withcertainty and celerity on the occurrence of an emergency of thecharacter specified, that means for furnishing the requisite powershould be set in operation by the initial or prime mover immediatelycontrolled by the instrument in which the defect or emergency may occur.Numerous mechanisms have hitherto been designed for this purpose; butthe majority have been lacking in some respect, either in not beingsensitive enough to be controlled quickly and certainly on theoccurrence of the defect or emergency, or in failing to at all timessupply the necessary power for stopping the machine, or in being liableto operate accidentally when not required.

. The object of the present invention is to provide a mechanismapplicable to nearly all, if not all, characters of machinery whereinautomaticity in stopping is desired, and controllable by the occurrenceof any emergency, and which at the same time will act instan- :5taneously and certainly, which will furnish ample power for stopping themachine, and which will not be liable to accidental operation.

The mechanism constituting the invention is not limited to anyparticular initiating instru mentality, nor is it limited to anyparticular finally-acting stopping device.

The newly-invented mechanism is illustrated in the accompanyingdrawings, in Which- Figure 1 is a view throughthe main driveshaft of amachine, showing the improved mechanism. Fig. 2 is a view of the same atright angles to the position shown in Fig. 1. Fig. 3 is a detail View.Fig. l is a View similar to Fig. 1, showing a modification. Figs.

5 and 6 are details of the modification.

A is a rotating shaft, which may be any shaft on the machine to whichthe improvements are to be applied, which rotates constantly during theoperation of the machine. This constantly-rotating shaft carries with ita cam or eccentric B, against the surface of which rests one end of arocking lever C, which is pivoted to any convenient stationary support,as at a. The end of the lever abutting against the cam or eccentric isheld at all times in contact therewith by any suitable means, such as bya spring Z). As long, therefore, as the machine is in operation thisrocking lever will be constantly swung or rocked, the rapidity of itsmovement depending upon the speed of the rotation of the shaft.Connected with this rocking lever is a sliding bar D. As shown in thedrawings, this sliding bar is-a straight bar connected to the rockinglever by an intervening connected rod 0, pivoted at opposite ends to thebar and lever, respectively, said sliding bar reciprocating in fixedguides at d or any c011- venient stationary support. This sliding bar Dcarries a projecting stud e.

E is a sliding shifting-rod, which is movably held in fixed guides f fon any conven- 10k ient stationary support, so that it is movablelongitudinally. This shifting-rod is actuated in one direction by aspring F. The shift' in g-rod effects the movement of the final stoppingmechanism, which may be actuated thereby by any convenient connection.For example, in case an ordinary shipper-lever is employed for shippinga driving-belt from a fast to a loose pulley the shifting-rod may abutdirectly against said lever, or may be pivotally or otherwise connectedthereto, or the shiftingrod may be connected with a lever controllingthe valve or stopcock in a steam-supply pipe. The shifting-rod is actuated by the spring I in order to effect the stopping of the machine, andby giving the proper tension to the spring a uniform force is always athand of the proper power to stop the machine. \Vhere the machine isrunning in proper order, this spring-actuated shifting-rod is heldretracted, such being its normal position.

The spring-actuated shifting-rod is held and locked in the normalretracted position by means of a pivoted swinging lever G, one arm g ofwhich rests in a notch h in the shifting-rod. The -other arm i of thispivoted swinging lever carries an oscillating catchlever II, pivotedthereto. This catch-lever carries on one end a catch 711, having itsfront face a abrupt and its upper rear edge 0 beveled. This catchnormally held just out of the path of the projecting stud c on thesliding bar I), the catch-lever itself being substantially parallel withthe sliding bar. The proper normal position of the catch can be securedby any. suitable means. Preferably the catch-lever is nearly balanced onthe pivot-connecting it with the swinging lever l, the catch end of thecatchlever being slightly heavier, however, so that the weight of thecatch end is sufficient to hold it out of the path of the stud c. Anyfixed stop, as p, can be employed to limit the movement of the catchbelow the path of the stud. Since, however, the relative positions ofthe several parts may be changed, as far as the planes occupied by themare concerned, modifications in the weighting of the catch lever may beintroduced without departing from the essential mode of operation of theseveral parts. It is only essential that the catch-lever should be anearly balanced lever, and that its catch end should be normally out ofthe path of the stud e. The lever Gis held in proper position andreturned thereto, so as to cause the locking-arm g to coact with thenotch h in the shifting-rod by means of a spring 8.

- The catclrlever H being a nearly balanced one, it is obvious that itis or may be made quite sensitive, so that in case a slight power isapplied to its free end If in the proper direction the catch m will bemoved into the path of the stud e on the. constantlysliding bar D. Incase the catch is so moved the stud on the sliding bar, on itsmovementinone direction, (that indicated by the arrow 10,) will strikeagainst the abrupt face of the catch. The force thus applied to thecatch, being that imparted by the cam 1; on the shaft A, which may bethe main drive-shaftof themachine, is only limited in its intensity bythe power of the machine. The force will hence be sufficient to carrywith the sliding bar the catch-lever, moving the latter bodily in thepath of the stud. The movement of the catchlever l'lcarries with it thearm 11 of the swing ing lever G, which swings on its pivot. By thismovement of the lever G its arm 9 is lifted out of the notch 7b, theforce actuating the lever G being amply sufficient to overcome thepressure upon the arm g due to the tension of the spring F. Theshifting-rod E being thus released, it is free to be moved by the springI and so operate the final stopping instrumentalities. In order,therefore, to stop the machine on the occurrence of a defect or otheremergency, it is only necessary that the initiating instrumentalityshould furnish su'liicicnt power to oscillate the nearly balancedcatch-lever, which can be made so sensitive as to be responsive to anydemands upon it.

The described locking mechanism for the spring-actuated shifting-rod Eis not essential, and a modification thereof is illustrated in Figs. 4,5, and 0. In these figures the shiftingrod is shown as capable of alateral movement in its guides, so that it may belocked in its retracted position by acoacting locking-lip X and notch 71, one of whichis on the shiftingrod and the other on any convenient stationary part. Alateral bodily movement of the shifting-rod will then release it. Tothus move the shifting-rod laterally, a presserleverI is employed, whichin turn is actuated by the swinging lever G. In this modification, as inthe preferred construction, the lever G unlocks or releases theshifting'rod.

The spring-actuated shifting-rod is in itself no part of the presentinvention, except in so far as it enters into combination with the otherfeatures, and hence it is only essential that it be released or unlockedby means of the swinging lever G. Nor need the springactuatedshiftingrod necessarily be a longitinlinally-sliding rod, since it may,if convenient, be a spring-actuated rod swinging on a pivot. 30threciprocating and swinging spring-actuated shifting-rods are well-knownmechanisms for shipping belts for stopping machinery.

Owing to the catch on being made with one face a abrupt and the other 0beveled, the catch will be acted upon by the stud 6 only when the latteris moving in the proper direction to release the locking mechanism ofthe spring-actuated shifting-rod. If the stud is moving in the oppositedirection at the moment when the catch m is elevated into its path, itwill ride upon the rear beveled face 0 of thecatch, thus depressing theof its path.

I claim as my invention- 1. In a stop-motion for machinery, a rotatingshaft, a cam or eccentric on said shaft, a rocking lever abuttingagainst said cam or eccentric, whereby it is swung or rocked, and a barconnected with said rocking lever, whereby said bar is moved in apredetermined path, said bar having a projecting stud, in combinationwith a swinging lever, a springactuated shifting-rod, a latch or lookholding said shifting-rod, said latch or look being controlled by saidswinging lever, and a catchlever pivotally connected with said swinginglever, the catch on said lever being normally out of the path of saidprojecting stud, but adapted to co-operate therewith, substantially asset forth.

2. In a stop-motion for machinery, a rotating shaft, a cam or eccentricon said shaft, a rocking lever abutting against said cam or eccentric,whereby it is swung or rocked, and a bar connected with said rockinglever, whereby said baris moved in a predetermined catch out path, incombination with a spring-actuated shifting-rod, a swinging levercontrolling said shifting-rod, and a catch-lever pivoted to saidswinging lever, the catch on said lever being normally out of the pathof said bar, but adapted to co-operate therewith, substantially as setforth.

3. In a stop-motion for machinery, a rotating shaft, a cam or eccentricon said shaft, a rocking lever abutting against said cam or eccentric,whereby it is swung or rocked, in combination with a spring-actuatedshiftingrod, a swinging lever controlling said shifting-rod, and acatch-lever pivoted to said swinging lever, said catch-lever beingnormally inoperative, but adapted to be moved through theinstrumentality of said rocking lever, substantially as set forth.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

SAMUEL L. FOSTER.

Witnesses:

JOSEPH L. CAVENDER, HENRY O. CONRAD.

